Pulp-wood digester



Feb. .19, 1929.

R. W. HOVEY PULP woon DIGESTER Filed Jan. 21, 1928 FIG. E.

IN VE NTOR REXW. HOVEY ATTORNEYS I 1,702,341 PATENT OFFICE.

, BEZ W. HOVEY, 01 ST. JOHN, NEW BRUNSWICK, CANADA.

PULP-WOOD DIGESTEB.

Application filed January 21, 1928. Serial No. 248,429.

This invention relates to new and useful improvements in pulp wood digsters and.

particularly to the nozzle equipment for feeding or circulating the liquor therethrough. The object of the invention is to provide a nozzle or such like liquor conveying means which will be quickl and easily installed or repaired, without amaging or dismantling the parts of the digester in proximity to said means.

Another object is to provide a nozzle connection in which the stresses exerted thereon will be transferred directly to the digester shell. m

A further object is to provide a nozzle or pipe connection and gland therefor, which will resist the action of the liquor passing through the nozzle.

According to my invention I provide a metallic sleeve which is secured to the lining of the digester. The sleeve has a threaded external surface projecting beyond the wall of the digester for receiving a nut and washer for sealing the opening in the shell. The nozzle is removably held in the sleeve and suitable sealing means are provided to prevent the liquor from passing between the nozzle and the sleeve. The nozzle is extended and a collar is secured thereto.

I Passing through the collar, or flange, are supporting studs which'transfer any'strain ex-- erted directly to the digester shell. A pipeconnection is secured to the collar bysuitable bolts, and suitable reinforcing ribs are pro-' vidcd for strengthenin the said connection.

In the drawings which illustrate my invention:

Figure 1 is a sectional side elevation of a nozzle and gland therefor showing its connection tothe digester shell.

Figure 2 is a sectional elevation taken on the line 2-2 Figure 1.

Figure 3 is a sectlonahside elevation taken on the line 3-3 Figure "1.

Referring more particularly to the drawings, 11 designates the outer metallic shell of a digester. which is provided with a suitable linin 12, which will resist the action of the chemicals used in the manufacture of chemical wood pulpr The lining and shell are apertured as shown at 13 and mounted in said apertures and secured by ridge keys 14 is the sleeve 15. The sleeve is cemented, or

otherwise secured to-the lining. The sleeve has an externally threaded portion 16 which projects beyond the outer face of the d1gester shell. To strengthen the shell around the aperture, a suit-able pad 17 is riveted or otherwise secured thereto. The apertures in the shell and the pad are slightly larger in diameter that the outside diameter of the projection. To seal this opening and prevent tween said projection and the shell, a lead washer 18 surrounds the sleeve and is pressed againstthe pad by means of a nut 19. A lead washer- 19 between the surface 38 and the inner surface of the shell is pressed, by movement of the nut 19, to seal the opening for the sleeve. The nozzle 20 is slidably motuited in the sleeve and is provided with a flange 21, which cuts against the face 22 of the sleeve. A sealing ring 23 of lead, or such like material, is placed between the adjacent faces of the flange and the sleeve. There is a space 26 between thesleeve and the outer wall of the nozzle. The outer wall of the nozzle is threaded and projects beyond the end of the sleeve and'receives a nut 24. Between said nut and the end of the sleeve a soft metallic washer 25 is placed to seal the space 26. The nut 24 draws the flange a ainst the sleeve at its flanged end. A threaded collar or flange 27 is secured to the end 28 of the nozzle. The flange is directly supported on studs 29 extending outwardly from the' reinforced portion of the digester shell. A double anged pipe connection 30 is secured to the flange 27 by means-of the bolts 31, whichpass through said flange and the adjacent flange 32 of the pipe connection. Suitable ribs or fins 33 may extend between the flanges of the pipe connection to reinforce same. The reinforcedconnection may be secured "to the pipes 34 and 35 of the liquor circulating, feed,

or discharge system. The free end 36 of the nozzle projects into the digester.

It will be readily understood that many modifications may be made to the general construction disclosed without departing from the spirit of the invention.

In operation the sleeve is permanently secured to the wall of the digester and the nozzle is easily sli ped into place and drawn tightly against t e sleeve by means of the nut on said sleeve. The washers which are of soft material are flattened out and, in spreading, seal the clearance spaces between the sleeve and the nozzle. The sleeve is drawn into place by a nut engaging with the wall thereof and the soft metal washer is laced between the wall of the digester and t e nut liquor from the digester frompassing beto prevent liquor from passing through the a erture formed in the digester. Theremova le flange secured to the nozzle and to the reinforcedsection of the shell, ensures a rigid connection, so that any strains which would otherwise be placed on the nozzle are transferred directly to the shell through the bolts or studs. The pipe connection in proximity to the removable flange is reinforced so that there is no deflection therein and the strains are transferred to the flange and from thence to the digester shell. The nozzle is very easily removed for repairs and all parts in proximity to the nozzle are protected fromthe eating action of the acid. A cementitious filler 37 is placed between the lining and the flange formed integral with the nozzle. There is practically no strain on the nozzle and sleeve, so that the parts in contact with the shell are prevented from vibration, and once the nozzle is fitted thereto, no further adjustments need be made. c

Having thus described my invention, what I claim is 1. In digester construction, a sleeve keyed to the lining of the digester and having a threaded portion projecting outwardly from the Wall of thedigester, a soft metallic washer surrounding the sleeve and a nut on the threaded portion for pressing the washer to seal the aperture in said wall around the sleeve.

' 2. In digester construction, a sleeve keyed to the lining of the digester, said sleeve having an externally threaded portion extending beyond the wall of the digester, a pipe passing through the sleeve, said pipe having a ing an externally threaded portion, extending from the outer wall of the digester, a pipe slidably mounted in the sleeve, said pipe having a flange at one end and athreaded portion at the other end, a soft metallic sealing member between the flange and the sleeve, a soft metallic washer surrounding the sleeve and fitting against the digester shell, a nut on said sleeve for sealing the aperture surrounding the sleeve by pressing against the adjacent washer, a sealing ring at the end of the sleeve and surrounding the pipe, and a nut on said pipe for drawing same into-position.

4. In digester construction, a sleeve secured to the lining of the digester, a pipe flanged at one end slidably mounted in the sleeve, adjustable sealing means between the sleeve and the ,digester wall, adjustable sealing means surrounding the pipe at both ends of the sleeve, a flange adj'ustably secured to the pipe and means for transferring the load from the flange to the wall of the digester.

5. A. device according to claim 4, having my hand.

REX WV. HOVEY.

stud connections between the adjustable 

